The HYROX Electrolyte Guide: Hydration, Sodium and Race Day Strategy

HYROX is one of the fastest growing fitness sports in Australia, and one of the most demanding from a hydration standpoint. Sixty minutes of continuous mixed-modal effort, eight 1km runs and eight functional stations, with sweat rates that often hit two litres an hour in hot rooms. The hydration strategy that gets you across the finish line in good shape is not the same as the one for a parkrun. This guide is built specifically for HYROX athletes.

Why HYROX hydration is different

  • Duration: 50 to 90 minutes for most age group athletes, long enough that pure water cannot keep up with sodium losses.
  • Intensity: Sustained near-threshold effort means elevated sweat rates that often exceed 1.5 litres an hour.
  • Indoor heat: Most HYROX venues are warm, poorly ventilated, and packed with athletes, which compounds sweat losses.
  • HASTA matters: If you race at the higher end (Pro, Doubles Pro) or any tested HYROX category, your supplements need to be HASTA or Informed Sport certified to be safe.

Your sodium target for race day

The research on endurance sodium needs lands in a wide range depending on individual sweat composition. For HYROX specifically, a useful working target is:

  • 500 to 1000mg of sodium consumed in the 60 minutes before your start time
  • 500 to 1000mg of sodium per hour during long sessions (open, training simulations, doubles)
  • 500 to 1000mg of sodium in the first 30 minutes after the finish line

Total sodium across race day for a competitive HYROX often lands in the 2,000 to 4,000mg range, which is significantly higher than mainstream low-sodium dietary advice. That is normal and intentional for high-output athletes.

HASTA certified options in our range

Three brands in our DRINK SALTD range are HASTA certified and safe for tested HYROX competitors:

  • Sodii, 1000mg sodium per serve. The cleanest dose for race day pre-loading and in-race intake.
  • Switch Hydrate Perform Sugar Free, 800mg sodium per serve plus 1000mg taurine. Built specifically for sustained high-intensity training.
  • Dr.Hydrate, balanced electrolyte plus vitamins and amino acids. Useful for daily training hydration rather than race day pre-load.

Race day protocol

Two days out

Drink consistently across the day, salt your meals slightly more than normal, and make sure dinner the night before includes a clean carbohydrate base. Avoid alcohol from 48 hours out.

Race morning, 60 to 90 minutes before start

Mix one serve of Sodii or Switch Hydrate Perform Sugar Free in 500ml of cold water and sip across 30 to 45 minutes. This pre-loads sodium before sweating begins.

30 minutes before start

Stop drinking large volumes. Sip small amounts to keep the mouth comfortable. Bathroom break.

During the race

For singles, in-race sipping is limited by the stations, but a 200 to 300ml bottle with one serve of high-sodium electrolyte stashed near transitions is achievable for most. For Doubles, your partner can carry and pass a bottle between stations.

Within 30 minutes of finishing

One serve of Sodii or Switch Hydrate Perform Sugar Free mixed in 500 to 700ml of cool water. Drink within the first 15 minutes if possible. Sodium retention is highest in the first hour post-effort.

Within 2 hours of finishing

A meal with carbohydrates, protein and salt. Continue sipping electrolytes through the afternoon.

Training day protocol

For day-to-day HYROX training (compromised conditioning sessions, station work, run intervals), the same principles apply at lower volume:

  • One serve 20 to 30 minutes before training
  • Optional second serve during sessions over 60 minutes
  • One serve post-training within 30 minutes

For lighter days and active recovery, a daily serve of Dr.Hydrate, Revitalise Balanced or LVL UP keeps daily electrolyte balance topped up without overdoing sodium.

Common HYROX hydration mistakes

  • Pre-loading with plain water. Dilutes the sodium you already have. Always pair high pre-race water intake with electrolytes.
  • Sticking to mainstream low-sodium sports drinks. 100mg sodium per bottle does not cover what HYROX athletes lose.
  • Trying a new brand on race day. Always test your race-day electrolyte and timing in training first.
  • Forgetting post-race. The 60 minutes after the finish line is your best window for sodium replacement.

FAQ

Is Sodii HYROX safe?

Yes. Sodii is HASTA certified, batch tested against more than 200 WADA banned substances, and used by HYROX competitors across Australia.

Can I use Switch Hydrate Perform (the carb version) for HYROX?

For Doubles or longer training simulations over 90 minutes, the carb version provides additional fuel. For a 60 minute HYROX Open, the Sugar Free version is usually a better fit unless you specifically want extra carbohydrates.

How do I know if I am losing more sodium than average?

White salt tide marks on dark training shirts, sweat that stings your eyes more than tap water, and a gritty feeling on your skin after evaporation are all signs you are a salty sweater. If two or three of those sound familiar, lean toward the higher-sodium options (Sodii or Switch Perform Sugar Free).

Shop the full DRINK SALTD electrolyte range, or take our Hydration Quiz for a personalised brand match.